Is that info still accurate?
I called AAdvantage on behalf of a friend and the agent told me:
if the the necessary PLT challenge miles (10K) is completed June 1, 2004 or later, then you get the status until Feb 2006.

The unofficial guide to AA site states that you get the status until Feb 2006 if you start the challenge on or after June 16.

I would confirm if you are taking the challenge.